--
-- Licensed to the Apache Software Foundation (ASF) under one
-- or more contributor license agreements.  See the NOTICE file
-- distributed with this work for additional information
-- regarding copyright ownership.  The ASF licenses this file
-- to you under the Apache License, Version 2.0 (the
-- "License"); you may not use this file except in compliance
-- with the License.  You may obtain a copy of the License at
--
--   http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing,
-- software distributed under the License is distributed on an
-- "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-- KIND, either express or implied.  See the License for the
-- specific language governing permissions and limitations
-- under the License.
--

--
-- User and connection IDs within history table can now be null
--

ALTER TABLE guacamole_connection_history
    ALTER COLUMN user_id SET DEFAULT NULL,
    ALTER COLUMN user_id DROP NOT NULL;

ALTER TABLE guacamole_connection_history
    ALTER COLUMN connection_id SET DEFAULT NULL,
    ALTER COLUMN connection_id DROP NOT NULL;

--
-- Add new username and connection_name columns to history table
--

ALTER TABLE guacamole_connection_history
    ADD COLUMN username varchar(128);

ALTER TABLE guacamole_connection_history
    ADD COLUMN connection_name varchar(128);

--
-- Populate new name columns by joining corresponding tables
--

UPDATE guacamole_connection_history
    SET username = guacamole_user.username
    FROM guacamole_user
    WHERE guacamole_user.user_id = guacamole_connection_history.user_id;

UPDATE guacamole_connection_history
    SET connection_name = guacamole_connection.connection_name
    FROM guacamole_connection
    WHERE guacamole_connection.connection_id =
        guacamole_connection_history.connection_id;

--
-- Set NOT NULL now that the column is fully populated
--

ALTER TABLE guacamole_connection_history
    ALTER COLUMN username SET NOT NULL;

ALTER TABLE guacamole_connection_history
    ALTER COLUMN connection_name SET NOT NULL;

--
-- Remove old foreign key constraints with ON DELETE CASCADE
--

ALTER TABLE guacamole_connection_history
    DROP CONSTRAINT guacamole_connection_history_ibfk_1;

ALTER TABLE guacamole_connection_history
    DROP CONSTRAINT guacamole_connection_history_ibfk_2;

--
-- Recreate foreign key constraints with ON DELETE SET NULL
--

ALTER TABLE guacamole_connection_history
    ADD CONSTRAINT guacamole_connection_history_ibfk_1
    FOREIGN KEY (user_id)
    REFERENCES guacamole_user (user_id) ON DELETE SET NULL;

ALTER TABLE guacamole_connection_history
    ADD CONSTRAINT guacamole_connection_history_ibfk_2
    FOREIGN KEY (connection_id)
    REFERENCES guacamole_connection (connection_id) ON DELETE SET NULL;